Comment # 3 on bug 960739 from Bernhard Wiedemann

it works on Leap 42.1 with
> rpm -q python-novaclient python-keystoneclient ca-certificates-suse
python-novaclient-2.26.0-2.2.noarch
python-keystoneclient-1.6.0-1.1.noarch
ca-certificates-suse-1.0-5.1.noarch

are you sure the SUSE CA rpm is properly installed?

Then you could try
openssl s_client -connect dashboardp2.cloud.suse.de:5000

and capture+paste the full output